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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab61dc5cf58bbef19e281acc1e8dd810ffa544dfa32b95e5a9373a59a70e02e' 
  AND token = 'EY6WuY4ep71yeVX+8r84Cfvc126brJN65d7KpgKG2QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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