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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d86b194e7220edc5db695db3ff6e52362a1159be26777c512eff1a603916bc6' 
  AND token = 'FA5VxN9/s6rDfKf0DZRvdcCDOLLrIxLElLatEqKNYsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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