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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc44ae0e5930c01f89844255934a6dbf69317a272318d5e2f2c9c02b1d4bc11c' 
  AND token = '8aHlE3aIexAQe2BBXVugjgiKSCd6YbSt0DcARw5fWu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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