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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19e05f7f4d8f5b38d0250829ebbbe94a1a51f371fbc461d169cc25c9d6525c3' 
  AND token = 'osSD6r2fplCdHdj9RF37SuqTodDqlz98aTRLI+s+XZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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