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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7516c3c7661dc2d9e3001ab65f8a2f0f667b4c562fa00f0878054df8814b867d' 
  AND token = '7AlnK5VxMjkEepi8JeQ1FATs91gdiBhwYyR1wDwBGKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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