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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb9590320113eece50a542dd1c31d6eae9e57e09471baeb055ffda39a934a1a' 
  AND token = 'YqkSyJA5qv7JkOpTsoXryv6DD8bAyoG1wsG7nAUGFa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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