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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4b58fe55452ea4d4795ee0a2b8a7551241f478e5d4be9aac102592238117a7' 
  AND token = 'eniiM2B4/Hr46S7HEIAVDVOa6NN0kgwvSuxATxbaFxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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