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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf26cebaf3795f2edfcc5c316fbdfa2aa2509cd42a271931ffe5248f481721d' 
  AND token = 'i+HBinv55/+uH/E2rKSQQ7tSLjSMojemGK1QgKG2f6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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