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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e0db5d69973e3a2c6b3c51dd3ff62f9b3aecb8d77f8f7d9ca6443516685a0a' 
  AND token = 'g1IAyD0+vVX6y2J66OCYN+BVojoK2TP5a3L1sFtB0uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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