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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c55483ac132d0f5478166700bd442b02b43fcf4c494d57dc4a9e3ec4bd5cf4a' 
  AND token = 'a86Gfdf2+NiqoJYvE1q4j88a/7urXbFySpmx3gPHhho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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