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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b4e400a8148e96c8c8f5489ca9b14ecf630eb9309bff39d54e089cdef0dfb6' 
  AND token = 'NkBWA2Dk8ZR/RivbWFbeWccbVOiElKZa/xHs5/5DFgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}