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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3bc56d400caa683ef31f23bb0dffeb7825e6c50d6baf690a1bc2f372cd0cbd' 
  AND token = 'gos/bkGlL69HCNyTIR/zIOXcz0HjO+Jk5bpf+nDF6vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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