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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f08246d5df074a5bda24fd6709d3ac6de527e3254442c3076ecdcb80d665cd' 
  AND token = 'kWiVO6x1aZmnolVB5dSzShCp5yue6ENYWwneZPuGC2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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