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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772abb708e4142fc98856663b511280a17e86c1022edfec3cbe0508a9e2a91c6' 
  AND token = 'OmysMP4sm3a1ErJaC/sjDp/9l3KBIDGWhV6wcWAmyq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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