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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f2a2f33ac9f740d01025ebab74d659bcc77350d6b0a9436f0f557228aa736e' 
  AND token = 'YU/HpVQ4ZpDdX10iKZTy3aPpeoGpBroLEN2l+3vgHPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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