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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55ec5c65c9ef43485b2ff50eb31bc0b5cbd5245cec182d891c6138c44f33d83' 
  AND token = 'rznQPrlgs6TWbg+8AmPpSDNQnHsuet9/3FmY1EHxQwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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