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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bedb9b107f620c68fa63895be68fa8626261171728640ff59c8ae5a79c3c2e' 
  AND token = 'sbFG0v77r+3AHZWCM4UYNAUbHIobdZagzihPw+hENoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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