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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764438f1571c0b54cd1e63223a31a94ad26cad720694e57d1156443f15c6cad3' 
  AND token = 'PAOupytgCHNclBo2oJwspTU7a22FTsfbUwpak6EAMlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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